VC STANDARDS

General Videoconferencing Standards

  • H.320 – The original ISDN videoconferencing standard.
  • H.321 – Videoconferencing standard over ATM
  • H.322 – Videoconferencing standard over IP with QoS,
  • H.323 – Packet-based multimedia communications systems
  • H.324 – An extension of H.320 for videoconferencing over PSTN lines
  • H.310 – Wide-band (MPEG-2) videoconferencing over ATM and B-ISDN

Video codecs

  • H.261 – video codec for >= 64kbps
  • H.263 – video codec for < 64kbps
  • H.264 – video codec for low bandwidths

Audio codecs

  • G.711 – PCM audio codec 56/64 kbps
  • G.722 – audio codec for 7 Khz at 48/56/64 kbps
  • G.722.1 – Codec enhanced quality (7 Khz analog bandwidth) audio into 24 or 32 kbps
  • G.723 – speech codec for 5.3 and 6.4 kbps
  • G.728 – speech codec for 16 kbps
  • G.729 – speech codec for 8/13 kbps

Call signallng and control

  • H.221 – 
  • H.223 –
  • H.224 –  
  • H.225 – call control protocol
  • H.231 – MCU (Multipoint Control Unit) for digital network up to 2 Mbit/s
  • H.233 – Encryption, security coding
  • H.235 – security
  • H.243 – MCU call set up (3 or more users) for digital network up to 2 Mbit/s
  • H.244 – H.221 + Bonding
  • H.245 – media control protocol
  • H.281 – Far End Kamera Kontrol
  • Q.931 – digital subscriber signalling
  • H.450.1 – Generic functional protocol for the support of supplementary services in H.323

H323 Annexes

  • Annex D – Real Time fax over H.323
  • Annex E – Multiplexed call signalling
  • Annex F – Simple Endpoint Terminal (SET)
  • Annex G – Text SET
  • Annex H – Mobility
  • Annex I – Operation over low QoS Networks
  • Annex J – Secure SET
  • Annex K – HTTP Service Control Transport
  • Annex L – Stimulus Signalling
  • Annex M – QSig Tunneling
  • Annex N – QoS

Data Videoconferecing Standards

 

T.120 Is an “umbrella” standard for data conferencing and works either inside H.320 or independently
T.121 Generic application Template; a guide to develop T.120 applications
T.122 Multipoint Communication Service (MCS)
T.123 Network specific transport protocols
T124 Generic Conference Control (GCC); the application protocol supporting reservations and basic conference control services for Multipoint teleconferences
T.125 Multi Communication Services (MCS); protocol specification
T.126 Collaborative data sharing, including “white board”, image sharing graphic display information and image exchange
T.127 Multipoint binary file transfer
T.128 Audio Video control. High level control protocols for the multimedia